Lingual Bar Position Requirements — NDEB AFK MCQ
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Correct answer: C — It is a rigid metal bar connecting RPD components on both sides of the mandibular arch, positioned in the lingual vestibule at least 4 mm below the gingival margin and above the active floor of mouth
The lingual bar is a half-pear-shaped rigid metal bar that serves as the major connector for mandibular RPDs. It must be positioned at least 4 mm below the free gingival margin (to avoid gingival impingement) and above the floor of mouth in its elevated (active) position (to avoid discomfort or dislodgement during tongue movement). Minimum dimensions are approximately 4 mm height × 1.5 mm width for adequate rigidity. If insufficient space exists between the gingival margin and floor of mouth, a lingual plate (broad, thin coverage) is used instead.
Reference: Carr – McCracken's Removable Partial Prosthodontics, 13th ed., 2015